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首页> 外文期刊>Journal of Applied Polymer Science >Blends of poly(ester urethane)s and polyesters as a general design approach for triple-shape memory polymers
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Blends of poly(ester urethane)s and polyesters as a general design approach for triple-shape memory polymers

机译：聚（酯聚氨酯）S和聚酯的混合物作为三重记忆聚合物的一般设计方法

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摘要

Poly(ester urethane)s represent a widely investigated class of thermoplastic polymers that exhibit a thermally triggered dual shape memory effect. This behavior is the result of urethane-rich hard segments that define the permanent shape, while domains formed by the crystallizable polyester segments act as the memory switch. We show here that blending poly(ester urethane)s with a second polyester having a different melting temperature is a straightforward and possibly general approach to create triple-shape memory polymers, in which two different temporary shapes can be programmed. To demonstrate this, we blended a poly(ester urethane) containing crystallizable poly(1,4-butylene adipate) segments with poly(butylene succinate) or poly(hexamethylene dodecanoate). The blends microphase separate and the different polyester segments form separate semicrystalline domains, which serve as switching elements that can be activated at different temperatures. The blends retain attractive mechanical properties and the shape memory characteristics are characterized by high fixities (70%-96%) and recovery rates (82%-94%).
机译：聚酯聚氨酯是一类广泛研究的热塑性聚合物，具有热触发双形状记忆效应。这种行为是由定义永久形状的富含氨基甲酸乙酯的硬段造成的，而由可结晶聚酯段形成的畴则充当记忆开关。我们在这里展示了将聚（酯-聚氨酯）与具有不同熔融温度的第二种聚酯共混是一种简单且可能通用的方法来创建三重形状记忆聚合物，其中可以编程两种不同的临时形状。为了证明这一点，我们将含有可结晶聚（1,4-己二酸丁二醇酯）段的聚（酯型聚氨酯）与聚（丁二酸丁二醇酯）或聚（十二酸六亚甲基酯）混合。共混物微相分离，不同的聚酯段形成独立的半晶畴，作为开关元件，可在不同温度下激活。共混物保持了诱人的力学性能，形状记忆特性的特点是高固定率（70%-96%）和回收率（82%-94%）。

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